In this April 19, 2018, file photo, Rivko Knox, of Phoenix, a volunteer with the League of Women Voters, collects signatures for a ballot measure on campaign financing outside a polling station in Glendale, Ariz. A lawsuit filed Tuesday, July 3, 2018, on Knox's behalf, seeks to overturn a 2016 law that bars groups in Arizona from collecting early mail-in ballots from voters and delivering them as part of get-out-the-vote efforts. (AP Photo/Anita Snow, File)